1. compound, deepen, heighten, intensify

make more intense, stronger, or more marked

Example Sentences:
'The efforts were intensified'
'Her rudeness intensified his dislike for her'
'Pot smokers claim it heightens their awareness'
'This event only deepened my convictions'

• compound
• heighten
• intensify

2. deepen, intensify

become more intense

Example Sentences:
'The debate intensified'
'His dislike for raw fish only deepened in Japan'

• intensify

3. deepen

make deeper

Example Sentences:
'They deepened the lake so that bigger pleasure boats could use it'

4. change, deepen

become deeper in tone

Example Sentences:
'His voice began to change when he was 12 years old'
'Her voice deepened when she whispered the password'

• change